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Detailed data description and availability
CERRA
Surface parameters
Metadata for CERRA surface parameters | |
Horizontal coverage | The model domain spans from northern Africa beyond the northern tip of Scandinavia. In the west it ranges far into the Atlantic Ocean and in the east it reaches to the Ural Mountains. Herewith, it covers entire Europe. |
Horizontal resolution | 5.5 km x 5.5 km |
Vertical coverage | Each surface parameter is valid for one vertical level and four different (near) surface levels exists:
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Vertical resolution | single level |
Temporal coverage | 1984-09-01 00 UTC – 2021-06-30 21 UTC |
Temporal resolution | Analyses are available 3 hourly at 00, 03, 06, 09, 12, 15, 18, and 21 UTC. |
Data type and format | Gridded data in GRIB2 |
Grid | Lambert conformal conic grid with 1069x1069 grid points |
Table 1: Overview Surface parametersAnchor table1 table1
Name | Unit | GRIB code | Analysis 3 hourly | Forecast | Height | |
1. | 2m relative humidity | % | 260242 | yes | yes | 2m |
2. | Total column integrated water vapour | kg/m2 | 260057 | yes | yes | vertically integrated above the surface |
3. | Total precipitation | kg/m2 | 228228 | - | yes | surface |
4. | 10m wind speed | m/s | 207 | yes | yes | 10m |
5. | 10m wind direction | degrees | 260260 | yes | yes | 10m |
6. | 10m wind gust speed | m/s | 49 | - | yes | 10m |
7. | Surface air maximum temperature | K | 201 | - | yes | 2m |
8. | Surface air minimum temperature | K | 202 | - | yes | 2m |
9. | 2m temperature | K | 167 | yes | yes | 2m |
10. | Skin temperature | K | 235 | yes | yes | surface |
11. | Albedo | % | 260509 | yes | yes | surface |
12. | Evaporation | kg/m2 | 260259 | - | yes | surface |
13. | Time-integrated surface latent heat flux | J/m2 | 147 | - | yes | surface |
14. | Time-integrated surface sensible heat flux | J/m2 | 146 | - | yes | surface |
15. | Time-integrated surface direct solar radiation | J/m2 | 260264 | - | yes | surface |
16. | Time-integrated surface net solar radiation | J/m2 | 176 | - | yes | surface |
17. | Time-integrated surface solar radiation downwards | J/m2 | 169 | - | yes | surface |
18. | Time-integrated surface net thermal radiation | J/m2 | 177 | - | yes | surface |
19. | Time-integrated surface thermal radiation downwards | J/m2 | 175 | - | yes | surface |
20. | Clear-sky net short-wave downward flux at the surface | J/m2 | 210 | - | yes | surface |
21. | Clear-sky net long-wave downward flux at the surface | J/m2 | 211 | - | yes | surface |
22. | Time integral of surface eastward momentum flux | N/m2 | 235017 | - | yes | surface |
23. | Time integral of surface northward momentum flux | N/m2 | 235018 | - | yes | surface |
24. | Mean sea level pressure | Pa | 151 | yes | yes | surface |
25. | Surface pressure | Pa | 134 | yes | yes | surface |
26. | High cloud cover | % | 3075 | yes | yes | above 5000m |
27. | Low cloud cover | % | 3073 | yes | yes | surface-2500m |
28. | Medium cloud cover | % | 3074 | yes | yes | 2500m-5000m |
29. | Total cloud cover | % | 228164 | yes | yes | above ground |
30. | Snow density | kg/m3 | 33 | yes | yes | surface |
31. | Snow depth | m | 3066 | yes | yes | surface |
32. | Snow depth water equivalent | kg/m2 | 228141 | yes | yes | surface |
33. | Snow fall water equivalent | kg/m2 | 228144 | - | yes | surface |
34. | Land-sea mask | dimension-less | 172 | yes | - | surface |
35. | Orography | gpm | 228002 | yes | - | surface |
36. | Surface roughness | m | 173 | yes | yes | surface |
| 37. | Soil temperature | K | 260360 | yes | yes | top layer of soil |
| 38. | Liquid Volumetric soil moisture | m3/m3 | 260199 | yes | yes | top layer of soil |
| 39. | Volumetric soil moisture | m3/m3 | 260210 | yes | yes | top layer of soil |
2m relative humidity
The 2-metre (2m) relative humidity (parameter name: surface air relative humidity) is the modelled humidity valid for the grid area (approximately 5.5km*5.5km = 30.25km2) determined for a height of 2m above the surface. The parameter is given in %, and is the relation between actual humidity and saturation humidity. Values are in the interval [0,100]. 0% means that the air is totally dry whereas 100% indicates that the air is saturated with water vapour. The saturation is defined with respect to saturation of the mixed phase, i.e. with respect to saturation over ice below -23°C and with respect to saturation over water above 0°C. In the regime in between a quadratic interpolation is applied. Surface air relative humidity is available for the analysis and the forecast time steps. For the forecast, the value is instantaneous meaning that it is valid for the last time step of the integration at the issued time step.
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Parameters on height levels
Metadata | |||||||
Horizontal coverage | The model domain spans from northern Africa beyond the northern tip of Scandinavia. In the west it ranges far into the Atlantic Ocean and in the east it reaches to the Ural Mountains. Herewith, it covers entire Europe. | ||||||
Horizontal resolution | 5.5 km x 5.5 km | ||||||
Vertical coverage | 11 height levels | ||||||
Vertical levels | 15m, 30m, 50m, 75m, 100m, 150m, 200m, 250m, 300m, 400m, 500m | ||||||
Temporal coverage | 1984-09-01 00 UTC – 2021-06-30 21 UTC | ||||||
Temporal resolution |
Analyses are available at 00, 03, 06, 09, 12, 15, 18, and 21 UTC. | ||||||
Data type and format | Gridded data in GRIB2 | ||||||
Grid | Lambert conformal conic grid with 1069x1069 grid points |
Table 2: Overview parameters on height levelsAnchor table2 table2
Parameter | Unit | GRIB code | Analysis 3 hourly | forecast | |
1. | Wind speed | m/s | 10 | yes | yes |
2. | Wind direction | degrees | 3031 | yes | yes |
3. | Pressure | Pa | 54 | yes | yes |
4. | Relative humidity | % | 157 | yes | yes |
5. | Temperature | K | 130 | yes | yes |
6. | Specific cloud liquid water content | kg/kg | 246 | - | yes |
7. | Specific cloud ice water content | kg/kg | 247 | - | yes |
8. | Specific rain water content | kg/kg | 75 | - | yes |
9. | Specific snow water content | kg/kg | 76 | - | yes |
10. | Turbulent kinetic energy | J/kg | 260155 | - | yes |
Wind speed
Wind speed is the wind speed valid for the grid area determined for a certain height (15m-500m) above the surface. The parameter is given in m/s. It is computed from both the zonal (u) and the meridional (v) wind components by wind speed=u2+v2. The wind speed is available for the analysis and the forecast time steps. The value is instantaneous meaning that it is valid for the last time step of the integration at the issued time step.
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Parameters on pressure levels
Metadata | |
Horizontal coverage | The model domain spans from northern Africa beyond the northern tip of Scandinavia. In the west it ranges far into the Atlantic Ocean and in the east it reaches to the Ural Mountains. Herewith, it covers entire Europe. |
Horizontal resolution | 5.5 km x 5.5 km |
Vertical coverage | 29 pressure levels |
| Vertical levels | From 1000 hPa to 1 hPa (1000, 975, 950, 925, 900, 875, 850, 825, 800, 750, 700, 600, 500, 400, 300, 250, 200, 150, 100, 70, 50, 30, 20, 10, 7, 5, 3, 2, 1) |
Temporal coverage | 1984-09-01 00 UTC – 2021-06-30 21 UTC |
Temporal resolution | Analyses are available at 00, 03, 06, 09, 12, 15, 18, and 21 UTC. |
Data type and format | Gridded data in GRIB2 |
Grid | Lambert conformal conic grid with 1069x1069 grid points |
Table 3: Overview parameters on pressure levelsAnchor table3 table3
Parameter | Unit | GRIB code | Analysis 3 hourly | forecast | |
1. | Cloud cover | % | 260257 | - | yes |
2. | Specific cloud liquid water content | kg/kg | 246 | - | yes |
3. | Specific cloud ice water content | kg/kg | 247 | - | yes |
4. | Specific rain water content | kg/kg | 75 | - | yes |
5. | Specific snow water content | kg/kg | 76 | - | yes |
6. | Turbulent kinetic energy | J/kg | 260155 | - | yes |
7. | Relative humidity | % | 157 | yes | yes |
8. | Temperature | K | 130 | yes | yes |
9. | U-component of wind | m/s | 131 | yes | yes |
10. | V-component of wind | m/s | 132 | yes | yes |
11. | Geopotential | m2/s2 | 129 | yes | yes |
Cloud cover
Cloud cover is the percentage of sky covert with clouds. It is valid for the grid at the corresponding height. The parameter is given in %. Total cloud cover is only available for the forecast time steps. The value is instantaneous meaning that it is valid for the last time step of the integration at the issued time step.
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Parameters on model levels
Metadata | |
Horizontal coverage | The model domain spans from northern Africa beyond the northern tip of Scandinavia. In the west it ranges far into the Atlantic Ocean and in the east it reaches to the Ural Mountains. Herewith, it covers entire Europe. |
Horizontal resolution | 5.5 km x 5.5 km |
Vertical coverage | 106 model levels (the lowest level is 106 to the model top level 1). The lowest model level is at about 12 m above the surface and the top level is at 1hPa. |
Vertical levels | 1, 2, 3, 4,… , 104, 105, 106 |
Temporal coverage | 1984-09-01 00 UTC – 2021-06-30 21 UTC |
Temporal resolution | Analysis are available at 00, 03, 06, 09, 12, 15, 18, and 21 UTC. |
Data type and format | Gridded data in GRIB2 |
Grid | Lambert conformal conic grid with 1069x1069 grid points |
Table 4: Overview parameters on model levelsAnchor table4 table4
Parameter | Unit | GRIB code | Analysis 3 hourly | forecast | |
1. | Specific humidity | kg/kg | 133 | yes | - |
2. | Temperature | K | 130 | yes | - |
3. | U-velocity | m/s | 131 | yes | - |
4. | V-velocity | m/s | 132 | yes | - |
Specific humidity
The specific humidity is the mass of water vapour per unit mass of air valid for the grid area at the corresponding model level. The parameter is given in kg/kg. Only analyses are stored for parameters on model levels. The value is instantaneous meaning that it is valid for the last time step of the integration at the issued time step.
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Below are the essential parameters describing the grid and the used Lambert Conformal Conic projection. More information about the grid and coordinates can be found in the FAQ.
Number of points along x-axis: 1069
Number of points along y-axis: 1069
X-direction grid length: 5500 m
Y-direction grid length: 5500 m
Projection: Lambert Conformal Conic
Central meridian: 8
Standard parallel 1: 50
Standard parallel 2: 50
Latitude of origin: 50
Earth assumed spherical with radius: 6371229 m
Latitude and longitude of the corner grid points in decimal degrees | ||
Grid point | Latitude | Longitude |
Upper-left | 63.7695 | -58.1051 |
Upper-right | 63.7695 | 74.1051 |
Lower-right | 20.2923 | 33.4859 |
Lower-left | 20.2923 | -17.4859 |
CERRA-EDA
CERRA-EDA comprises the same domain as CERRA and has exactly the same set of parameters as the high-resolution CERRA dataset. It differs only in the horizontal resolution, which is 11km as well as in the number of available time steps. CERRA-EDA has four analyses per day, at 00, 06, 12 and 18 UTC. Starting from the analyses, forecasts are run for six hours. Forecast fields are saved with hourly resolution.
Metadata for CERRA-EDA parameters | |
Horizontal coverage | Same as CERRA. |
Horizontal resolution | 11 km x 11 km |
Vertical coverage | Same as for CERRA parameters. |
Vertical resolution | Same as for CERRA-parameters. |
Temporal coverage | Same as for CERRA. |
Temporal resolution | Analyses are available at 00, 06, 12, and 18 UTC. |
Data type and format | Gridded data in GRIB2 |
Grid | Lambert conformal conic grid with 565x565 grid points |
The CERRA-EDA grid description
Below are the essential parameters describing the CERRA-EDA grid and the used Lambert Conformal Conic projection. More information about the grid and coordinates can be found in the FAQ in section 2.3.
Number of points along x-axis: 565
Number of points along y-axis: 565
X-direction grid length: 11000 m
Y-direction grid length: 11000 m
Projection: Lambert Conformal Conic
Central meridian: 8
Standard parallel 1: 48
Standard parallel 2: 48
Latitude of origin: 48
Earth assumed spherical with radius: 6371229 m
Latitude and longitude of the corner grid points in decimal degrees | ||
Grid point | Latitude | Longitude |
Upper-left | 63.4028 | -60.4047 |
Upper-right | 63.4028 | 76.4047 |
Lower-right | 17.6121 | 34.3203 |
Lower-left | 17.6121 | -18.3203 |
References
- Bazile E, R. Abida, A. Verelle, P. Le Moigne and C. Szczypta (2017): MESCAN-SURFEX surface analysis, deliverable D2.8 of the UERRA project, http://www.uerra.eu/publications/deliverable-reports.html
- El-Said A., P. Brousseau, M. Ridal and R. Randriamampianina (2021): A new temporally flow-dependent EDA estimating background errors in the new Copernicus European Regional Re-Analysis (CERRA), Earth and Space Science Open Archive, pp. 28, doi 10.1002/essoar.10507207.1, https://doi.org/10.1002/essoar.10507207.1
- Niermann D. et al. (2017): Scientific report on assessment of regional analysis against independent data sets, deliverable D3.6 of the UERRA project, http://www.uerra.eu/publications/deliverable-reports.html
- Ridal M., S. Schimanke and S. Hopsch (2018): Documentation of the RRA system: UERRA (C3S deliverable D322_Lot1.1.1.2, Documenting the UERRA system)
- Soci C., E. Bazile, F. Besson and T. Landelius (2016). High-resolution precipitation re-analysis system for climatological purposes. Tellus A, Dynamic Meteorology and Oceanography, 68:1, DOI: 10.3402/tellusa.v68.29879
- Verver Gé (2017): User Guidance, deliverable D8.4 of the UERRA project, http://www.uerra.eu/publications/deliverable-reports.html
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